Chemistry - Online Test
Q1. The oxidation number of oxygen in most compounds is
Answer : Option D
Explaination / Solution:
Oxygen is the most electronegative element. Oxygen have 6 electrons in its outermost shell and to gain noble gas configuration oxygen have to take 2 more electrons.
Q2. Ionic solids containing large differences in sizes of ions show
Answer : Option B
Explaination / Solution:
Smaller atoms can easy occupy interstitial postion showing Frenekel Defect.
Q3. Buna – N is a polymer which is stretchable because of one of the following. Choose the most appropriate.
Answer : Option B
Explaination / Solution:
Buna N is polymer which is stretchable due to weakest intermolecular forces.
Q4. Ammonia act as a Lewis base because nitrogen has
Q5. Calorimetry is a branch of science dealing with
Answer : Option B
Explaination / Solution:
Calorimetry is a branch of science dealing with measuring the amount of energy transferred as heat
Q6. Which technique utilizes the density difference between the ore and the impurity to concentrate the ore is
Answer : Option B
Explaination / Solution:
Levigation is process of grinding an insoluble substance to a fine powder while wet. The material is introduced into mill together with water. It is based on the density difference between ore and impurity.
Q7. According to IUPAC nomenclature for elements with Z greater than 100,the root 'sept' corresponds to the digit:
Answer : Option B
Explaination / Solution:
Sept is for 7.
Numerical 0 1 2 3 4 5 6 7 8 9
roots nil un bi tri quad pent hex sept oct en
Q8. Emission spectrum of a material results from the material's (atom or molecules)
Answer : Option A
Explaination / Solution:
The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state. The photon energy of the emitted photon is equal to the energy difference between the two states. There are many possible electron transitions for each atom, and each transition has a specific energy difference. This collection of different transitions, leading to different radiated wavelengths, make up an emission spectrum.
Q9. Nitrogen dioxide (NO2) causes :
Answer : Option A
Explaination / Solution:
Nitrogen dioxide is responsible for acute respiratory disease in children. It also causes irritating red haze in traffic and congested places, damages leaves of plants, retard rate of photosynthesis, toxicity to living tissues and harm to textile fibres and metals.
Q10. Electronic configuration of Mn2+ is
Answer : Option D
Explaination / Solution:
Mn has atomic number 25.
